Math, asked by le4enadineeshY, 1 year ago

the radius of the inner boundary of a plane circular ring is 14 cm. The area of the ring is 346.5 sq.cm. find the radius of the outer boundary

Answers

Answered by ARoy
16
Area of the inner ring = πr²
=22/7×14×14
=616 cm²
∴, area of the total ring = 346.5+616= 962.5 cm²
∴, πr²=962.5
or, r²=962.5×7/22
or, r²=6737.5/22
or, r²=306.25
or, r=17.5 cm Ans.
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